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an information in a permanent readable form.They produce printed outputs of results,program and data.Printers that can used with computers are character printers,line printers,page printer.A character printer prints one character of the text at a time.A line printer prints one line of the text at a time.A page printer print a page of the text at a time.the above classification of the printers is based on as how they print,there are two more types on the technologies used in their manufactures.Impact and non impact printer,the impact printers use an electro mechanical mechanism that causes pins to strike against a ribbon and paper to print the text,the non impact type printer is usually faster than an impact type.The disadvantage of non impact type printer is that the produce only a single copy of the text whereas impact printers produce multiple copies of the text.An ink jet printer use dot matrix approaches to print text and graphics one type of ink jet printers uses one or more nozzles in the print head that emit a steady stream of tinyink drops.each droplets is charged when it passes through a valve.Then it passes through horizontal and vertical deflecting plates.this plates deflects the ink drops to direct them to the desired spots on the paper to form the impression of a character.